how do i log all incomming and outgoing messages in Exchange 2003

Scenario:
I have a exchange 2003sp2 server on windows server 2003sp1, standard edition. I need to track all incomming and outgoing mail traffic. I do not want to read the messages, i do not want to read the emails. I dont care what they send. I just want to log them to monitor heavy traffic times. How do i enable this?
Also, is there some way to log smtp communication errors if the messages do not reach the intended recipient? Aside from a NDR, can i create this in a log file?

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